<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>第3天</title>
</head>
<body>
    <div class="container">
        <div>1</div>
        <div>2</div>
        <div class="items">3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
        <div>7</div>
        <div>8</div>
        <div>9</div>
        <div>10</div>
        <div>11</div>
        <div>12</div>
    </div>
</body>

<style>
    .container{
        display: flex;
        width: 350px;
        height: 300px;
        background-color: rgb(202, 74, 74);
        flex-direction: row;
        flex-wrap: wrap;
        align-content: flex-start;
        justify-content: space-between;
        align-items: flex-end;
        gap: 10px 20px;
    }
    .container>div{
        width: 60px;
        height: 60px;
        background-color: rgb(18, 101, 32); 
    }
    .items{
        flex-grow: 4;
    }
</style>
</html>